This is what I used to do. I put up a dome tent in the middle of the living room. That cut down on the running around room. I put a tv in front in the tent door, played movies and kept the snacks flowing. I never had a issue.
We never had 11 girls over. I suppose 8 total at various times. We used the tent as well. Oh - and threatened to take away their phones for the night if they were individually focused on them. Only had to take them away on one over-nighter.
Yep - chaos at the time, but good memories for everybody.